diff --git a/zb.c b/zb.c
new file mode 100644
index 0000000..676c906
--- /dev/null
+++ b/zb.c
@@ -0,0 +1,114 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+char **av;
+
+void
+usage (char *s)
+{
+	fprintf (stderr, "Usage: %s [file]\n");
+}
+
+char *
+token (int c)
+{
+	static char s[200];
+
+	switch (c) {
+		case 0: return "0";
+		case 128: return "long";
+		case 129: return "for";
+		case 131: return "plot131 ";
+		case 132: return "cls";
+		case 133: return "else";
+		case 135: return "next";
+		case 137: return "input";
+		case 138: return "dim";
+		case 141: return "goto";
+		case 143: return "if";
+		case 147: return "rem";
+		case 159: return "end";
+		case 162: return "open";
+		case 171: return "plot171 ";
+		case 176: return "def";
+		case 178: return "print";
+		case 180: return "do";
+		case 181: return "until";
+		case 185: return "while";
+		case 189: return "line";
+		case 186: return "wend";
+		case 190: return "fn";
+		case 199: return "peek";
+		case 204: return "to";
+		case 207: return "and";
+		case 205: return "then";
+		case 206: return "step";
+		case 213: return "len";
+		case 217: return "int";
+		case 238: return "chr$";
+		case 248: return "inkey$";
+		case 249: return "left$";
+		case 251: return "mid$";
+		default:
+			  sprintf (s, "[%d]", c);
+			  return s;
+	}
+}
+
+void
+process (FILE *f, char *name)
+{
+	while (1) {
+		int a, b;
+		int c;
+
+		a = getc (f);  /* line number */
+		b = getc (f);  /* high half of line number */
+
+		if (a == EOF || b == EOF)
+			return;
+
+		printf ("%05d ", a + 256 * b);
+
+		a = getc (f);  /* line length */
+
+		if (a == EOF)
+			return;
+
+		while (a-- > 1 && (c = getc (f)) != EOF) {
+			if (c > 127)
+				printf ("%s", token (c));
+			else
+				printf ("%c", c);
+		}
+
+		printf ("\n");
+	}
+}
+
+int
+main (int argc, char **argv)
+{
+	av = argv;
+
+	if (argc < 2) {
+		process (stdin, "standard input");
+	} else if (argc == 2) {
+		FILE *f = fopen (argv[1], "r");
+
+		if (f) {
+			process (f, argv[1]);
+			fclose (f);
+		} else {
+			fprintf (stderr, "%s: %s: %s\n", argv[0], argv[1],
+				 strerror (errno));
+			exit (EXIT_FAILURE);
+		}
+	} else {
+		usage (argv[0]);
+		exit (EXIT_FAILURE);
+	}
+
+	return (EXIT_SUCCESS);
+}